For central galaxies, which are the dominant galaxies in dark
matter halos, the most important internal and environmental
parameters seem to be the central velocity dispersion of the galaxy
and the halo mass respectively [1]}.
This indicates that mechanisms that are related to the galaxy
bulge mass or central black hole mass, such as the
active galactic nuclei (AGN) feedback [2]}, [3]}, [4]},
and those related to halo mass, such as galaxy
interaction [5]}, [6]}, [7]}
and virial shock heating [8]}, [9]},
may be responsible for the quenching.
These mechanisms, in particular the AGN feedback, are expected to
become dominant for massive galaxies, and help to yield
a `pivot halo mass', \(M_{\rm h, p}\sim 10^{12}\, h^{-1}{\rm M_\odot }\) , in the stellar mass
-halo mass relation (SHMR), at which, the efficiency for galaxy
formation is maximum [10]}, [11]}.
